package com.czwj.util;


import org.springframework.beans.BeansException;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

@Component
public final class SpringUtils implements BeanFactoryPostProcessor, ApplicationContextAware
{
   /** Spring应用上下文环境 */
   private static ConfigurableListableBeanFactory beanFactory;
   private static ApplicationContext applicationContext = null;

   @Override
   public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException
   {
       SpringUtils.beanFactory = beanFactory;
   }

   /**
    * 获取对象
    *
    * @param name
    * @return Object 一个以所给名字注册的bean的实例
    * @throws org.springframework.beans.BeansException
    *
    */
   @SuppressWarnings("unchecked")
   public static <T> T getBean(String name) throws BeansException
   {
       return (T) beanFactory.getBean(name);
   }

   /**
    * 获取类型为requiredType的对象
    *
    * @param clz
    * @return
    * @throws org.springframework.beans.BeansException
    *
    */
   public static <T> T getBean(Class<T> clz) throws BeansException
   {
       T result = beanFactory.getBean(clz);
       return result;
   }

   /**
    * 如果BeanFactory包含一个与所给名称匹配的bean定义，则返回true
    *
    * @param name
    * @return boolean
    */
   public static boolean containsBean(String name)
   {
       return beanFactory.containsBean(name);
   }

   /**
    * 判断以给定名字注册的bean定义是一个singleton还是一个prototype。 如果与给定名字相应的bean定义没有被找到，将会抛出一个异常（NoSuchBeanDefinitionException）
    *
    * @param name
    * @return boolean
    * @throws org.springframework.beans.factory.NoSuchBeanDefinitionException
    *
    */
   public static boolean isSingleton(String name) throws NoSuchBeanDefinitionException
   {
       return beanFactory.isSingleton(name);
   }

   /**
    * @param name
    * @return Class 注册对象的类型
    * @throws org.springframework.beans.factory.NoSuchBeanDefinitionException
    *
    */
   public static Class<?> getType(String name) throws NoSuchBeanDefinitionException
   {
       return beanFactory.getType(name);
   }

   /**
    * 如果给定的bean名字在bean定义中有别名，则返回这些别名
    *
    * @param name
    * @return
    * @throws org.springframework.beans.factory.NoSuchBeanDefinitionException
    *
    */
   public static String[] getAliases(String name) throws NoSuchBeanDefinitionException
   {
       return beanFactory.getAliases(name);
   }

   @Override
   public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
       if(SpringUtils.applicationContext == null){
           SpringUtils.applicationContext  = applicationContext;
       }

   }

   //获取applicationContext
   public static ApplicationContext getApplicationContext() {
       return applicationContext;
   }


}
